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Notes Payable (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 6 Months Ended
Apr. 30, 2014
Jun. 30, 2014
Y
Dec. 31, 2013
Jun. 30, 2014
Letter Of Credit [Member]
Jun. 30, 2014
Short-term Debt [Member]
Jun. 30, 2014
Floating rate notes payable (1)
Dec. 31, 2013
Floating rate notes payable (1)
Jun. 30, 2013
Floating rate notes payable (1)
Jun. 30, 2014
Line of Credit [Member]
Amount of current borrowing capacity under unsecured credit facility                 $ 500
Unsecured Credit Facility, Expiration Date                 Sep. 22, 2015
Optional extension period of unsecured credit facility                 September 2016
Maximum borrowing capacity under unsecured credit facility       100         750
Maximum term of bid rate loans (days)                 180
Lesser of amount stated or the amount available under the line of credit                 250
Outstanding letters of credit under credit facility       10.7         150.0
Available amount under unsecured credit facility                 339.3
Other Short-term Borrowings         30.0        
Notes payable, effective interest rate 6.00%                
Repayments of Debt 8.9                
Notes payable   $ 2,700.2 $ 2,530.8     $ 390.5 $ 211.3 $ 253.0  
Weighted Average Interest Rate   4.20%       0.90%   1.00%  
Weighted average maturity of indebtedness (including unsecured line of credit) (in years)   6.2